Brain scans?
Stephen yes - he's been remembering a lot more about Derleth through meditation, and has now been uncovering memories of his life before being brought to Derleth, so he's a believer and wants to help Mobius.
Thor yes - he's a puppy dog and very enthusiastically wants to help. He might also go around the party asking others if they got their minds scanned and 'You should try it!'
Harry - hesitates because he doesn't like the memories he has and he wonders if this scan will bring out more memories he doesn't want to know. But he does so anyway because loyal to DSS